1) Would it make since (game performance wise / data security) to get another 80 gb intel x25 and put them both in raid 0
RAID 0 does nothing for data security. There is not duplication or parity copy of data in RAID 0, it's just basically parallel drives splitting the load for increased speed.
First thing I would do would be to take a closer look at what's on your current 80G SSD and see if there is anything you can move off.
Really if you have 3 games running on SSD, chances are one of them is probably less demanding and could be moved off to your HDD.
Save the money, or at least wait until the newer SSD's come out so current generation prices drop.